330 THE MICROSCOPICAL NEWS. 
was divided, the tentacles budded or branched out in one or two 
places on the same arm, giving that arm a forked appearance. 
Fig. 91 represents a Hydra which was divided through the foot and 
body into three parts, but not through the head. It remained in 
this state after the cut parts had healed, for eight weeks, budding 
freely from each foot-stalk, and, finally, separating two of the foot- 
stalks from the body, by the strongest part pulling itself away from 
the Hydra. 
The parts thus severed produced a new head. 
Fig. 92 represents a single tentacle with a small portion of the 
head attached. I have already described the growth of a single 
tentacle with no part of the body attached to it, and shown that 
it produced a perfect Hydra. But the tentacle now under con- 
sideration had nothing to do with. the formation of the new body. 
The tentacle retained its full length, the body being formed by the 
small portion of the head attached. 
On the sixth day two new tentacles could be seen, and on the 
eighth day two more tentacles protruded. On the tenth day the 
new body was perfect, though small in comparison to the large 
tentacle. In two more days the new tentacles were fully grown, 
and also the new body. 
The last experiment performed was one I have never seen men- 
tioned ; and that is the severance of the disk or sucker from a full- 
grown Hydra. 
Fig. 93. This is really to me one of the strangest of sights. The 
transformation from a flat piece of protoplasm to a full grown and 
perfect Hydra is really wonderful. I first observed the flat piece 
or mass, blown out like a balloon (Fig. 94), the lower part adhering 
to the glass, beautifully transparent, so that I could see quite 
through its thin walls. No opening was observed, proving at once 
that it had no anal canal. No contraction took place, and it 
remained for three days exactly in the same shape. 
On the fourth day, it began to contract at the base, so that on 
the following day, the anterior-end assumed the ball-shape and thin 
foot-stalk exactly as Fig. 89, only much smaller. For two more 
days there was no change. 
On the eighth day, three minute processes appeared (Fig. 95), 
but their growth was very slow and irregular. ‘The body also began 
to enlarge, and continued to do so for the two, following days. 
On the eleventh day, the three tentacles were half the length of 
a full-grown polype, and two other arms also began to shew them- 
selves ; also, a small protuberance was observed, which in turn 
formed a young polype. The young one first caught its food, as 
before observed. 
In seventeen days from the time of division, it was a perfect and 
full-grown Hydra, with the young still attached, 
